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SubjectRe: [PATCH 0/7] x86 dma_*_coherent rework patchset
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On Tue, 12 Aug 2008 17:24:10 +0200
Joerg Roedel <joerg.roedel@amd.com> wrote:

> Hi,
>
> this patchset reworks the dma_*_coherent functions in the DMA layer for the x86
> architecture. The patch series extends the existing DMA backends with missing
> *coherent callbacks and simplifies the generic function to basically only call
> the registered backend. This allows future optimizations in hardware specific
> IOMMU implementations.
> The code ist tested on AMD64 with AMD IOMMU and GART as well as on my old 486
> box. It is not yet tested on a Calgary IOMMU system.
>
> Joerg
>
> git diff --stat tip/master:
>
> arch/x86/kernel/amd_iommu.c | 2 -
> arch/x86/kernel/pci-calgary_64.c | 14 +++++
> arch/x86/kernel/pci-dma.c | 116 +++----------------------------------
> arch/x86/kernel/pci-gart_64.c | 31 ++++++++++
> arch/x86/kernel/pci-nommu.c | 45 +++++++++++++++
> 5 files changed, 100 insertions(+), 108 deletions(-)

Really nice. I think that this is how other architectures that support
multiple IOMMUs handle dma operations, and this is the right thing for
x86 too.


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